Driving dog for lathes



Nov. 27, 1923.

A. WOOD DRIVING DOG FOR LATHES Filed Feb. 1, 1921 ill Patented Nov. 27, 1923.

UNITED STATES 1,475,616 PATENT OFFICE.

AUGUSTUS WOOD, OF FITCHBUBG, MASSACHUSETTS, ASSIGNOR TO IVIANNING, M'AX- WELL & MOORE, 1110., OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY;

DRIVING DOG FOR LATHES.

Application filed February 1,1921.

To all whom it may concern:

Be it known that I, AUeUs'rUs WOOD, a citizen of the fUniteclStates, and resident of Fitchburg, in the county of Worcester and State of Massachusetts, have invented new and useful Improvements in Driving Dogs for Lathes, of which the following is a specification.

This invention relates to driving dogsfor lathes and has for its object the provision ofan automatic-bite dnivingdog characterized .by simple and substantial construction, ease and accuracy of adjustment, and regulatedor restrained depth ofubite into the work. In particular, the improved driving-dog herein described is adapted to that class of lathes commonly known as wheel lathes which are used for turning the tires of railway rolling-stock wheels, mounted on their axles.

Driving dogs, such as herein described, are affixed to the face plate of a wheel lathe, and impart movement to the work mounted in the lathe by means ofa toothed bit which forms part of the driving dog, and is adapted toset its teeth with firm engagenientyinto the wheel of which the tire is being-turned.

1n the drawings hereto annexed, which show the structure of a driving dog embodying and illustrating my invention, and improvement,

The invention accordingly consistsin the features. of construction, combinations of elements and arrangement of parts which will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated in the following claims.

Figure 1 is a view of a drivingdog, in side elevation, partly broken. away to show sections of the bracket, bit, and other parts;

Figure 2 is an end. elevation, viewed from the left of Figure 1,

Figure 3 is a top plan view, and

Figure at, is an end elevation viewed from the right of Figure 1.

In the drawings there is illustrated a work engaging bit and means for mounting it upon a face; plate orthe like for movement in a direction inclined toward the work; as illustrated. The bracket 1 is provided with a base 1 adapted to attachment to the faceplate of a lathe, as by bolts 2, in the usual manner. In the outer part of the bracket Serial No. 441,702.

there is formed the way 1 inclined to the base at an angle suited to produce the automatic'bite of a work engaging bit 4 into the work. An angle of; inclination of 20 degrees has been found eflective for this purpose. A hardened plate 8is fixedin the way 1?, and the bit 4 is arranged in the way, to slide on this bearing-plate 3. The bit 4 has the usual teeth :or serrations 4: to engage and drive the work in unison with the rotating face plate of the lathe; and in its base-portion is bored from end to end, the portion l being smooth and slightly larger in diameter than the. portion 4,which is internally threaded to engage a threaded bolt 5. v

The threaded bolt 5 is slida'bly mounted in the bracket; more precisely its unthreaded portion 5 passes slidably through an abutment-block 6, which is fixed, to the bracket 1 by means of pins 7,, 7. The outer part of the bolt 5 is screw threaded at 5; nuts 8, 8 engage the. thread at 5, and these nuts constitute or represent the stop which regulates and controls the sliding movement, andconsequently the depth of bite,of the bit l into the work. At its outermost end, the bolt 5 is shapedat 5 to receive a turning wrench.

Between the bit-engaging thread and the part 5 the bolt v5 is provided with [means such as the shoulder 53 for seating against the bracket; in the.specificarrangementhere shown, for seating against the block 6, which is. practically. a part of the. bracket. Atthe end which lies at the other side of its thread-engagement with the bit l, the bolt 5 is shapedas at 5 to afford a seat for the spring 9, which is held on the: plate 11,

this plate being secured by bolts 12,12 to the bracket 1. In order to exclude foreign matter such as metal chips and grit from the threaded seatof the bolt 5 in the bit at,

a felt or fiber washer 10;is provided.

The operation of the above described driving dog is as follows: The bracket 1 being bolted to the face plate of the lathe, and the 'bit 4 being clear of the work, the stop nuts 8, '8 are backed away from the abutment block 6 if necessary, and by means of a wrench applied tothe end 5 of the bolt 5, the bit 4 is advanced along the inclined way 1 toward the work until its teeth @come in contact withthe wheel ,rim,or other work which has been placed in the lathe. The

res

pressure produced by this contact is sustained by the seat of the bolt 5, at 5 against the abutment block 6 of the bracket 1. This setting of the bit 4 does not compress the spring 9, which bears on the end of the bolt 5.

The proper limit of further bite of the bit 3% against and into the work having been determined either by precalculation ore perience, the stop nuts 8, 8, are now turned forward and set at such a distance from the abutment block 6'that, when the power of thef lathe is applied to the work and the bit 4; responds by sliding up the inclined way i on the bearing plate 8, the stop nuts 8 will abut against the abutment block 6 and thus impose a limit to the end thrust er;- erted on the work by the wedging-action of the bit 4 and its inclined bearing on the bracket. The permitted sliding movement of the bit 4:, after it has made first contact with the work, will be slight, so that the spring 9 which is compressed when the bit 4 and bolt 5 move together up the inclined way 1, undergoes but little increment of distortion. As this spring is normally under compression, as soon as the lathe stops, the spring moves the bit t and bolt 5 down the inclined way 1 away from the work until the shoulder 5 seats against the abutment plate 6 of the. bracket 1.

In the actual operation of the lathe, the bolt5 and nuts 8, 8, constitute and perform the function of a stop directly and rigidly attached to the bit 4;, the block 6 furnishing the coacting abutment for the stop. In the preparatory operations, the screw thread engagement of the bolt 5, which attaches the stop to the bit, enables the length of the stop attachment to be adapted to the particular work in hand; and the adjustability of the stop (as by such means as the nuts 8, 8) enables the relation of the stop to its abutment to be the same, no. matter at what part of the inclined way the bit may be when it is set against the work.

As many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all mat ter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

What I claim, and ters Patent is:

1. In a device of the character described in combination, a work engaging bit, means for mounting said bit upon a face plate or the like for movement ina direction inclined toward the work, a stop for limiting the movement of said bit toward the worl and means for adjusting said stop. i'

2. In a device of the character described desire to secure by Letin combination, a work engaging bit, means for mounting said bit upon a face plate or the like for movement in a direction inclined toward the work, means for adjustably limiting the movement away from said work, and means for adjustably limiting the movement toward said work.

3. In a device of the character described in combination, a work engaging bit, means for mounting said bit upon a face plate or the like for movement in a dir ction inclined toward the work, means for adjustably limiting the movement away from said work, and means for adjustably limiting the movement toward said work, and resilient means for urging said bit against said first mentioned limit.

I. In a device of the character described in combination, a bit supporting member, means for mounting said member upon a face plate or the like, for movement in a direction inclined toward the work, means for limiting the movement of said member away from said work and a work engaging bit adjustably mounted on said member.

5. In a device of the character described in combination, a bit supporting member, means for mounting said member upon a face plate or the like, for movement in a direction inclined toward the work, means for limiting the movement of said member away from said work, means for adjustably limiting the movement toward said work, and a work engaging bit adjustably mounted on said member.

6. In a device of the character described in combination, a work engaging bit, means for mounting said bit upon a face plate or the like for movement in a direction inclined toward the work, a stop for limiting the movement of said bit toward the work while in engagement with said work.

7 In a driving-dog for a lathe, the combination of a bracket having a base attachable to the face plate of a lathe and a way inclined to the base, a work-engaging bit slidable in said way, an adjustable stop attached to said bit, and an abutment toengage said stop. 8. In a driving-dog for a lathe, the com-- bination of a bracket having a base attachable to the face plate of a lathe and a way inclined to the base, a work-engaging bit slidable in said way, a bolt in screw-threaded engagement with the bit, slidably mounted 011 and seating against said bracket, a stop mounted on said bolt, and an abutment to engage said stop.

9. In a drivingdog for a lathe, the combination of a bracket having a base attachable to the face plate of a lathe and a way in clined to the base, a work-engaging bit slidable in said way, a bolt in screw-threaded engagement with the bit, slidably mounted on and seating against said bracket, an adjustable stop mounted on said bolt, and an abutment to engage said stop.

10. In a driving-dog for a lathe, the combination of a bracket having a base attachable to the face plate of a lathe and a Way inclined to the base, a Work-engaging bit slidable in said Way, a bolt in screw-threaded engagement With the bit, slidably mounted on and seating against said bracket, a stop mounted on said bolt, and an abutment to engage said stop, and a spring engaging the end of said bolt normally urging the bolt to its seat against the bracket.

11, In a driving-dog for a lathe, the combination of a bracket having a base attachable to the face plate of a lathe and a Way inclined to the base, a Work-engaging bit slidable in said Way, a bolt in screw-threaded engagement with the bit, slidably mounted on and seating against said bracket, an adjustable stop mounted on said bolt, and an abutment to engage said stop, and a spring engaging the end of said bolt normally urgring the bolt to its seat against the bracket.

igned by me at F itchburg, Massachusetts, 2

this twenty second day of January, 1921.

AUGUSTUS WOOD. 

